Do these two links help you identify the lights?
Lucas LR6 Spots Headlights Given your 146mm measurement is 5.75" I suspect you are looking for LR6's. These are not easy to find (rear mounted). They also had two tops (upstanding) as on mine and a Lucas "button" badge on the top (in green). I have one of these if it helps. I spent time on Ebay and eventually got some NOS ones.
Try this link to Ebay (worldwide serch). Most are either in poor condition or bottom mounted. Sometimes you get lucky.
